[bugfix?] Add overlap cell even if intersection has zero transmissibility

[blattms]

While there might be no flow of oil/gas/water over an intersection with zero transmissibility, there might still be heat conduction. I think in that case we need to see the neighbor in parallel.

I have to admit that I don't have the slightest idea how heat transport is implemented. So this wild guess might very well be wrong.

Hence this is up for discussion,

[blattms]

jenkins build this please

[blattms]

benchmark please

[ytelses]

Benchmark result overview:

Test	Configuration	Relative
opm-git	OPM Benchmark: drogon - Threads: 1	1.008
opm-git	OPM Benchmark: drogon - Threads: 8	1.212
opm-git	OPM Benchmark: punqs3 - Threads: 1	1.013
opm-git	OPM Benchmark: punqs3 - Threads: 8	1.012
opm-git	OPM Benchmark: smeaheia - Threads: 1	1.014
opm-git	OPM Benchmark: smeaheia - Threads: 8	0.996
opm-git	OPM Benchmark: spe10_model_1 - Threads: 1	1.01
opm-git	OPM Benchmark: spe10_model_1 - Threads: 8	0.993
opm-git	OPM Benchmark: flow_mpi_extra - Threads: 1	0.995
opm-git	OPM Benchmark: flow_mpi_extra - Threads: 8	1.001
opm-git	OPM Benchmark: flow_mpi_norne - Threads: 1	1.003
opm-git	OPM Benchmark: flow_mpi_norne - Threads: 8	0.999
opm-git	OPM Benchmark: flow_mpi_norne_4c_msw - Threads: 1	0.989
opm-git	OPM Benchmark: flow_mpi_norne_4c_msw - Threads: 8	0.988

• Speed-up = Total time master / Total time pull request. Above 1.0 is an improvement. *

View result details @ https://www.ytelses.com/opm/?page=result&id=2501

[atgeirr]

While there might be no flow of oil/gas/water over an intersection with zero transmissibility, there might still be heat conduction. I think in that case we need to see the neighbor in parallel.

Good point. Would it be easy to make this configurable? The original implementation comments that not adding this overlap may improve parallel performance, which sounds like an option is a good idea. Also we do not have any idea if this condition has ever been triggered (or at least I don't), maybe we should try to make a count?